Monsters of the Paleozoic: sea scorpions

Eupteryds are an extinct group of Paleozoic aquatic arthropods.

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What do we know about teeth?

The lesson introduces you to various types of teeth and their functions.


The ancestors of Arachnida and Crustacea belonged to the class Trilobita.

The lar gibbon

A monogamous species of ape living on the trees.

Freshwater fishes

Many freshwater fishes are also popular as food.


The best known cartilaginous fish, sharks, do not chew their food; they use their razor-sharp...

Veiled chameleon

Chameleons are reptiles with an ability to change their colors.

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Common blackbird

This animation demonstrates birds' bones and eggs through the example of the common...

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